Method of forming in-situ boron nitride for ceramic matrix composite environmental protection

Patent metadata

Field	Value
Publication number	US-2017341985-A1
Application number	US-201715657832-A
Country	US
Kind code	A1
Filing date	Jul 24, 2017
Priority date	Apr 7, 2014
Publication date	Nov 30, 2017
Grant date	—

Abstract

A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material includes the steps of providing a ceramic matrix composite material having a fiber reinforcement material; and forming in situ a layer of boron nitride on the fiber reinforcement material.

First claim

1 - 18 . (canceled)

19 . A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material, said method comprising:
providing a ceramic matrix composite material having a fiber reinforcement material; forming in situ a layer of boron nitride on the fiber reinforcement material; providing a B4C material and a Si3N4 material and depositing a layer of said B4C material and a layer of said Si3N4 material on said fiber reinforcement material, wherein said layer of said B4C material and said layer of said Si3N4 material are deposited sequentially; depositing said Si3N4 material onto said fiber reinforcement material and providing said B4C material as filler particles in a ceramic composite material matrix surrounding said fiber reinforcement material and said B4C material being located immediately adjacent the fiber reinforcement material; heating said B4C material and said Si3N4 material to a temperature above 1200 degrees Centigrade; and forming a hexagonal boron nitride reaction product.

20 . A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material, said method comprising:
providing a ceramic matrix composite material having a fiber reinforcement material; forming in situ a layer of boron nitride on the fiber reinforcement material; providing a B4C material and a Si3N4 material and depositing a layer of said B4C material and a layer of said Si3N4 material on said fiber reinforcement material, wherein said layer of said B4C material and said layer of said Si3N4 material are deposited sequentially; depositing said B4C material onto said fiber reinforcement material and providing said Si3N4 material as filler particles in a ceramic composite material matrix surrounding said fiber reinforcement material and said Si3N4 material being located immediately adjacent the fiber reinforcement material; heating said B4C material and said Si3N4 material to a temperature above 1200 degrees Centigrade; and forming a hexagonal boron nitride reaction product.

21 . A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material, said method comprising:
providing a ceramic matrix composite material having a fiber reinforcement material; forming in situ a layer of boron nitride on the fiber reinforcement material; providing a B4C material and a Si3N4 material and depositing a layer of said B4C material and a layer of said Si3N4 material on said fiber reinforcement material, wherein said layer of said B4C material and said layer of said Si3N4 material are deposited sequentially; applying a matrix slurry containing said B4C material and said Si3N4 material as filler particles to the fiber reinforcement material or to a preform; heating said B4C material and said Si3N4 material to a temperature above 1200 degrees Centigrade; and forming a hexagonal boron nitride reaction product.

22 . A ceramic matrix composite material having a composite matrix and a plurality of reinforcement fibers, each of said reinforcement fibers having a layer of hexagonal boron nitride thereon and said hexagonal boron nitride not being present throughout a bulk of the composite matrix.

23 . The ceramic matrix composite material of claim 22 , wherein said reinforcement fibers are selected from the group consisting of silicon carbide (SiC), Si—C—O, Si—C—N—C, Si—B—C—N, carbon, aluminum oxide, zirconium oxide, glass, mullite, and silicon nitride fibers.

24 . The ceramic matrix composite material of claim 22 , wherein said ceramic matrix composite material is used to form a part for a gas turbine engine.

25 . The ceramic matrix composite material of claim 24 , wherein said part comprises one of a combustor liner, a turbine blade, a turbine vane, an exhaust flap and seals, and a blade outer air seal.

26 . The ceramic matrix composite material of claim 22 , wherein said layer of hexagonal boron nitride surrounds each of said reinforcement fibers.

Assignees

• United Technologies Corp

Inventors

• Magdefrau Neal
• Sheedy Paul

Classifications

• C04B2235/524

  Non-oxidic, e.g. borides, carbides, silicides or nitrides · CPC title

• C04B2235/656

  characterised by specific heating conditions during heat treatment · CPC title

• C04B35/62894

  with more than one coating layer · CPC title

• C23C16/342

  Boron nitride · CPC title

• C04B35/62868 Primary

  Boron nitride · CPC title